Sleek Wall Soap Holder

Here's my soap holder as a first attempt at creating and printing something in 3D. I started learning Blender less than 1 week ago, so there could be problems with this, I'm not sure. If you notice anything wrong with it, please let me know. After printing, the inside edge of the front face had a few strings that didn't really connect. I'm not sure why or the technical term for it.The soap holder is attached to the wall by a strong double sided tape.It's very sturdy and looks good on the wall.